JLPT N4
ことにする
Decide to ~
Structure
Verb dictionary form ことにする
How it works
This grammar point is used to express a personal decision or a choice made by the speaker. It focuses on the act of deciding to perform a specific action, typically using the dictionary form of a verb combined with 'koto ni suru'.
Examples
健康のために、毎日野菜を食べることにしました。
For my health, I have decided to eat vegetables every day.
来年、日本へ留学することにします。
I decide to study abroad in Japan next year.
高いから、この靴は買わないことにします。
Because they are expensive, I decide not to buy these shoes.
Common mistakes
Do not confuse '~koto ni suru' (personal decision) with '~koto ni naru', which indicates a decision made by an outside party or circumstances beyond your control.
Tip
To express a decision you made in the past that is still in effect as a habit or a rule, use the form '~koto ni shite iru'.
More JLPT N4 grammar
See ことにする in real Japanese
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